USB

Disks

SSD disks can be used as system disks by using a 80pin SCSI U160 <-> SATA adapter, such as ACARD ARS-2160H, ARS-2320H or ARS-2320S.
(If you buy an ARS-2320, which is a U320 adapter, you will still be limited to U160 bandwidth because SCSI in Fuel, Tezro etc. is U160.)
More info at http://forums.nekochan.net/viewtopic.php?f=3&t=16720307

Diskless operation is supported on SGI IRIX. However, an existing IRIX server is required to create the client tree, because the tools used to create the diskless trees are native to IRIX.
If/when a procedure is devised to install a diskless system without involving another IRIX machine, it will be posted here.